class MetaBox {

	protected $fields;

	public function __construct() {
		add_action( 'add_meta_boxes', [ $this, 'register_meta_box' ] );
		/**
		 * Frontend Course Create Support
		 */
		add_action( 'dozent/frontend/create-course', [ $this, 'frontend_course_builder' ] );

		add_action( 'wp_ajax_dozent_save_course_metabox', [ $this, 'dozent_save_course_metabox' ] );

		add_action( 'dozent_course/course_tab_content/before/general', [ $this, 'course_access_method' ] );
		add_action( 'dozent_course/course_tab_content/after/general', [ $this, 'add_difficulty_level' ] );

		add_action( 'dozent/course_metabox/saved', [ $this, 'save_difficulty_level' ] );
		add_action( 'dozent/course_metabox/saved', [ $this, 'save_information' ] );

		//Course Builder Frontend Support
        add_filter( 'dozent_course_settings_tabs', [ $this, 'course_builder_frontend_support' ] );
	}

	public function register_meta_box() {
		add_meta_box( 'dozent-course', __( 'Course', 'dozent' ), [ $this, 'admin_course_builder' ], 'dozent_course', 'advanced', 'high' );
	}

	public function get_default_fields() {
		$sections = [];

		$sections['general'] = [
			'title'      => __( 'General', 'dozent' ),
			//'desc'       => __( 'General Settings', 'dozent' ),
			'icon_class' => ' dicon-cog',
			'callback'   => '',
			'fields'     => [
				'maximum_students' => [
					'type'        => 'number',
					'title'       => __( 'Maximum Students', 'dozent' ),
					'label_title' => __( 'Enable', 'dozent' ),
					'default'     => '0',
					'desc'        => __( 'Number of maximum students can enroll in this course, set zero for no limits',
						'dozent' ),
				],
				//course_levels
			],
		];

		$sections['curriculum']      = [
			'title'      => __( 'Curriculum', 'dozent' ),
			//'desc'       => __( 'Build your course with Dozent course builder.', 'dozent' ),
			'icon_class' => ' dicon-book',
		];
		$sections['intro_video']     = [
			'title'      => __( 'Intro Video', 'dozent' ),
			'desc'       => __( 'A quality introduction video shows that you are prepared and provides a good first impression for your students.', 'dozent' ),
			'icon_class' => ' dicon-play2',
			'callback'   => [ $this, 'intro_video' ],
		];
		$sections['information']     = [
			'title'      => __( 'Information', 'dozent' ),
			'desc'       => __( 'Course general information like course duration, benefits of the course, requirements, target audience.', 'dozent' ),
			'icon_class' => ' dicon-check',
			'callback'   => [ $this, 'course_information' ],
		];
		$sections['attach_products'] = [
			'title'      => __( 'Attach Product', 'dozent' ),
			'desc'       => __( 'Attach WooCommerce/EDD product to sell the course.', 'dozent' ),
			'icon_class' => ' dicon-product',
		];

		/*
		 * TODO: need to move it pro version
		$sections['prerequisites']   = [
			'title'      => __( 'Prerequisites', 'dozent' ),
			'desc'       => __( 'Student have to must complete give courses before enrol this course.', 'dozent' ),
			'icon_class' => ' dicon-clipboard',
		];
		*/
		$sections['instructors']     = [
			'title'      => __( 'Instructors', 'dozent' ),
			'desc'       => __( 'Take courses by multiple instructors.', 'dozent' ),
			'icon_class' => ' dicon-instructor',
			'callback'   => [ $this, 'course_instructors' ],
		];

		return apply_filters( 'dozent_course_settings_tabs', $sections );
	}

	public function course_builder_frontend_support( $sections ){
		global $dozent_course_creation_page;

		if ( $dozent_course_creation_page !== 'frontend' ){
			return $sections;
		}

		$course_front_field = [];
		$course_front_field[ 'essential' ] = [
			'title'      => __( 'Essential', 'dozent' ),
			'icon_class' => ' dicon-graduation-cap',
			'callback'   => [ $this, 'course_essential' ],
        ];

		$sections = array_merge( $course_front_field, $sections );

		return $sections;
    }

	public function admin_course_builder(){
		global $dozent_course_creation_page;
		$dozent_course_creation_page = 'admin';

		$this->course_builder();
	}

	public function frontend_course_builder(){
		global $post, $dozent_course_creation_page;

		$dozent_course_creation_page = 'frontend';

		wp_reset_query();

		$course_id = (int) dozent_input_text( 'course_id' );

		if ( $course_id ){
			$post_id = $course_id;
		}else{
			$post_id = wp_insert_post( [
				'post_title' => __( 'Auto Draft', 'dozent' ),
                'post_type' => 'dozent_course',
                'post_status' => 'auto-draft'
			] );
		}

		$post = get_post( $post_id );
		setup_postdata( $post );

		dozent_load_template( 'dashboard/my-courses/course-builder-header' );
		echo "<form action='' method='post' id='dozent-front-coursebuilder-form'>";
		dozent_nonce_field();
		do_action( 'dozent_front_coursebuilder_form_start' );
		echo "<input type='hidden' name='frontend_course_id' value='{$post_id}' />";

	    $this->course_builder();

	    do_action( 'dozent_front_coursebuilder_form_end' );
		echo "</form>";

	    wp_reset_query();
    }

	/**
	 * Course Builder
	 *
	 * This method containing main logic and view files to create course
	 *
	 *
	 * @since DozentLMS 1.0.0
	 *
	 * @see course_builder();
	 */

	public function course_builder() {
		global $post;
		$this->fields = $this->get_default_fields();

		$settings_meta       = get_post_meta( get_the_ID(), '_dozent_course_settings', true );
		$this->settings_meta = (array) maybe_unserialize( $settings_meta );

		if ( dozent_count( $this->fields ) && $post->post_type === 'dozent_course' ) {
			include DOZENT_ABSPATH . "views/metabox/course_metabox.php";
		}
	}

	public function generate_field( $fields = array() ) {
		if ( dozent_count( $fields ) ) {
			foreach ( $fields as $field_key => $field ) {
				$type = dozent_array_get( 'type', $field );
				?>
				<div class="dozent-option-field-wrap dozent-field-row-<?php echo $type; ?>">
					<?php
					if ( isset( $field['title'] ) ) {
						?>
						<div class="dozent-option-field-title">
							<label for="">
								<strong><?php echo $field['title']; ?></strong>
							</label>
						</div>
						<?php
					}
					?>
					<div class="dozent-option-field flex-grow-1 dozent-field-<?php echo $type; ?>">
						<?php
						$field['field_key'] = $field_key;
						$this->field_type( $field );
						if ( isset( $field['desc'] ) ) {
							echo "<p class='desc dozent-text-muted'>{$field['desc']}</p>";
						}
						?>
					</div>
				</div>
				<?php
			}
		}
	}

	public function field_type( $field = array() ) {
		include DOZENT_ABSPATH . "views/metabox/field-types/{$field['type']}.php";
	}

	public function get( $key = null, $default = false ) {
		return dozent_array_get( $key, $this->settings_meta, $default );
	}

	/**
	 * @param $post_ID
	 * @param $post
	 *
	 * Fire when course saving...
	 */

	/**
	 * @param $post_ID
	 *
	 * Save course metabox via save_course action hook
	 */
	public function save_course( $post_ID ) {
		do_action( 'dozent/course/save/before', $post_ID );
		$this->save_course_metabox( $post_ID );
		do_action( 'dozent/course/save/after', $post_ID );
	}

	/**
	 * Save Course metabox via Ajax
	 */
	public function dozent_save_course_metabox() {
		$post_ID = dozent_input_text( 'course_id' );

		do_action( 'dozent/course/save/before', $post_ID );
		$this->save_course_metabox( $post_ID );
		do_action( 'dozent/course/save/after', $post_ID );

		wp_send_json_success();
	}

	/**
	 * @param $post_ID
	 *
	 * Save Course Meta Box
	 */
	public function save_course_metabox( $post_ID ) {
		do_action( 'dozent/course_metabox/before_save', $post_ID );

		$_dozent_course_settings = dozent_input_array_field( '_dozent_course_settings' );
		if ( dozent_count( $_dozent_course_settings ) ) {
			update_post_meta( $post_ID, '_dozent_course_settings', $_dozent_course_settings );
		} else {
			delete_post_meta( $post_ID, '_dozent_course_settings' );
		}

		/**
		 * Intro Video
		 */
		$video = dozent_input_array_field( 'video' );
		update_post_meta( $post_ID, '_video', $video );


		do_action( 'dozent/course_metabox/saved', $post_ID );
	}

	public function course_access_method() {
		include_once DOZENT_ABSPATH . '/views/metabox/part/course_access_method.php';
	}


	public function course_price_type_closed() {
		echo '<h1>Closed Price Type</h1>';
	}

	/**
	 * Add difficulty Level metabox at the course settings
	 *
	 * long description
	 *
	 * @since DozentLMS 1.0.0
	 *
	 */

	public function add_difficulty_level() {
		include_once DOZENT_ABSPATH . '/views/metabox/part/difficulty_level_input.php';
	}

	public function save_difficulty_level( $post_ID ) {
		$difficulty_level = dozent_input_text( '_difficulty_level' );

		if ( $difficulty_level ) {
			update_post_meta( $post_ID, '_difficulty_level', $difficulty_level );
		} else {
			delete_post_meta( $post_ID, '_difficulty_level' );
		}
	}


	/**
	 * Course Essential Fields
	 *
	 *
	 * @since DozentLMS 1.0.0
	 *
	 * @see course_essential();
	 */

	public function course_essential(){
		include_once DOZENT_ABSPATH . '/views/course_builder/essential.php';
	}

	/**
	 * Course Intro Video Fields
	 *
	 * @since DozentLMS 1.0.0
	 *
	 * @see intro_video();
	 */

	public function intro_video(){
		include_once DOZENT_ABSPATH . '/views/course_builder/intro_video.php';
	}

	public function course_information() {
		include_once DOZENT_ABSPATH . '/views/metabox/part/information.php';
	}



	/**
	 * Save course information meta
	 *
	 * Example usage:
	 *
	 *     save_information();
	 *
	 * @since DozentLMS 1.0.0
	 *
	 * @param $post_ID
	 */

	public function save_information( $post_ID ) {

		$_benefits        = dozent_input_textarea( '_benefits' );
		$_requirements    = dozent_input_textarea( '_requirements' );
		$_target_audience = dozent_input_textarea( '_target_audience' );

		dozent_update_post_meta( $post_ID, '_benefits', $_benefits );
		dozent_update_post_meta( $post_ID, '_requirements', $_requirements );
		dozent_update_post_meta( $post_ID, '_target_audience', $_target_audience );

	}

	public function course_instructors() {
		include_once DOZENT_ABSPATH . '/views/metabox/part/instructors.php';
	}

}